Tidal Volume Changes from Rest to Exercise

Steps:

• Recall that tidal volume is the air volume per breath at rest, typically 0.5 dm³ (500 ml).
• During exercise, breathing deepens to meet oxygen demand, increasing tidal volume.
• Standard physiology texts state rest tidal volume as 0.5 dm³ and exercise up to 3.0 dm³ for moderate activity.
• Compare options to these values to identify the match.

Why A is correct:

• Matches the defined rest tidal volume of 0.5 dm³ and typical exercise increase to 3.0 dm³ per physiology standards.

Why the others are wrong:

• B: Overstates exercise volume at 5.0 dm³, exceeding moderate activity norms.
• C: Understates rest volume at 2.0 dm³, which is closer to vital capacity than tidal.
• D: Identical to C, incorrectly elevates rest volume to 2.0 dm³.

Final answer: A